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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8d84a370f78e478f357aa99d9ef7a67c45397b241f466449abe4a4f6ac5bde' 
  AND token = 'w9gJiXUMAMmohYD2yasciQzShEvV6rFGEGAu5pW63u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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