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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6177cb84aa3ffa11b0c363cf255d5a122bd0212689b92cb939048be05e646a62' 
  AND token = 'RVAOLFTYAckUXWvp9g15W4D2jr5E2qRpEKWQ0hrK854=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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