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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b0f6202fb2e9dea33887d95f04b6e3bd1a19aee32f7e58b2bc9387685c27a1' 
  AND token = 'XqfEqniMWs8I9FAWyvmw0wxRu1baCyFdTvKSdcyx6aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}