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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72e2891b8e1d513545f5840c5e86dc875163abd72525cb8aa82f2ea81190a36' 
  AND token = 'Rb7KO2jpgJHf3lbwaVICagfQCfYdXsScTtQdQmw8vRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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