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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf8656c71b4aab64dd5830237a1a4b217339a25cfc33208ce2e6e79b70b45cd' 
  AND token = 'ucFp2y81iv0p0UANhbjJ/OnGKkb7mvs6DRB0ZB4vmBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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