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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f087c78fa3bd1d946de40bfffd235321a530a8219e395c0c61514a194743113' 
  AND token = 'g6BshuqDui3T7w65+1aOmK/naeukArOFCa5ztaLHABk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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