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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c354ecb35455d01912fb2f723dd2397df862152d1117c1b9bf32d7366610ef' 
  AND token = '+tBHUgs6MQ15oW6cEabygkkjbtMGV6jlZmVgYE3xQak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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