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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c264630c6007a4c85ecdb6cf01062648be516c78278e49b24d2ff7965570fba3' 
  AND token = 'deGvS0wxRdYjI/llPLSqApUKQmARz64QWejc+mRXoic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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