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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe8dd0fa326ae269239c8eee6f4ccc10e3fb8d779a332653f9aa8d35c58dc96' 
  AND token = 'zbtDyF1GYABgAEFe6UIdmPGQJqdEr9z7V6/0t6/XjxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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