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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a1c7da1b953c3bf4eb5ab5f9721abf787acff8b61861b8e3a7040b75c80e87' 
  AND token = 'OK95WmBvSgtghEClAtiIOOI/4FGwKLHOhmqCoLPxQ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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