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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa235c193130538e6012e9d94c99e45f76075cb1be73671dc76d5f734a48d32' 
  AND token = '7LcfDkbh98tNHNI0Pb3fBEO2LQgbqD7uFQcaORUHwJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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