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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62cde659ef73a7a59343ed0dafe770dad05d4c3f46747febef14ca2e6e6a4ea' 
  AND token = 'm9+BpkTkP2RoQ6122tZ+vextTmF+R18EFv5q87t42IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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