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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef53bd9b1cab0c437ab24c95c04e69328bd2a22986d9df19a25104db53f1c72' 
  AND token = 'S7/n5xEtFl16CaMksJMSzFvFSXCp88+xnGAIdRKC7XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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