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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86374e6ce7e3007aa34a9ab68a3bcb99f0dfee5014b86c29affd6eb764c48ef7' 
  AND token = 'PiU+dNtHgGAU18a2RtKmSmjroYYOFwyxGrgZZOG9dSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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