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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffab8b9730c4b0e7b60f2fdca3656a70c36a8228ad8888d470930e2208dccd6c' 
  AND token = 'Be/HftKxvSOMOOBWNXfCvWGbR5t0QS/nUmbOXUZeJxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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