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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be94ae41b7140e82a59ec23e8a32dc5a36d92605851590b593483b5d37be76e' 
  AND token = 'YJAuYPPd+Q0hzZrRKyCLl1Xcbrab40VWLsdIII3dDyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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