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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52290727550371f0c8a9970ff44e2a347d0d6d37c1b021023c3e0fc9d840187' 
  AND token = 'sp6n0/E0LDnLe8vItQ7QeVNx0Au/6eAQD+efpkLDJ6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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