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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685ca2554b8d5a22e9778098dfd8f50b46954e101d7ea52eb085cb2b001dbbd9' 
  AND token = 'HkGbTwYRaBz+cmItd3ccv3DlqEfUC/XaY3Xh6W1yy2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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