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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b698930c2c92716e3261463d84d5fa3f3661301226f1dde25697b7a38d12d07' 
  AND token = 'KGdJE0RiubqNnQQI1GW58Qc9Kg43d+1ezFHG9c0owaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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