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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1f8272ce8b0ba93ba1ecfbe91f6547d5d02970048c6bd4b16fbbbddb2aa666' 
  AND token = 'U8PC+Xtxs/C/roSzY2dp4OCTCz5GJxKvvdwnXQsJ4hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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