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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c91e9c54acbd1c53417724cf242383d1fced4b945bd418146d1ee95863e9037' 
  AND token = 'OZZzFaBtQ6SXNacutxuMNJhSqmI2LYR3namabFBB2X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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