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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85535c147c75cb8942b102f86a5397aa436a1d1b262e22704d4dd5689b11bf05' 
  AND token = 'jowATYcSdNu3GFvC9kFIf2SR+ai7p6mxZuJSQwo8gi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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