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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2029e6a7ca1b7eea2509e0c5a3cf58ff621bcf13fc86b814c28ab7f91cbe125' 
  AND token = 'XX7Tcu5GwyzF3II5UtTplYYLob8DMyv4yQG3redxRFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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