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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b38eea83022bc4087e1a28453a20e5ea6d36a1fb648ad9dfda81a013a263813' 
  AND token = 'D5+wCaDIK2O0r6zbCb/njXx/w0s7IBzC7cZjLLAUttI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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