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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886513f50eb6261dd50f0848e962a3f5f923ed29672a0c357c4f99969365ce63' 
  AND token = 'CjNiOP9dgqX+1xVY4sfxzfHqiE0xVz9DbsN0cAMJX3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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