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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd51cd1e05ea1550ec93a17e8f5cd294e056013bc79b06b029b99a37231e778' 
  AND token = 'VoUM+UYhRMSDdqsfZUGNsANaaS0vJudfU4NkHHtcf4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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