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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cbaca9538b60c64852f64db297b59239874ba541790c4daf6118afe13b6ded' 
  AND token = 'PmwxL/53rg2tcD9MtapwsWfs6Nqu1Ct6t71aUJICZrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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