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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fbc8c29af8de9b2b2dd958cf8bbe3be4a0c73f8bc1a4e10c731c8b9d658c70' 
  AND token = 'mT71IBUy41l8M+fklI48uV97H6CBBjarX6Y5m1smmQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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