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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf713458f48f0827f168f7309dc6a6f51d95ff80d59aa995e85201ddea2cc86' 
  AND token = '3HY6k4HoAR0NSwaksWWMgytFe7E4u770Cz01L2kOAiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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