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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6750b2bc4423ce7e690b677a5522c9f2bd17ec1da4bd0f378ddcecd1d8d6528' 
  AND token = 'X1ZescCyP4t69795hnaOOeBLc+PesZ6uqKQFgOI/0uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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