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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90175cc7fc50824fe6a2255eff0c427f3946157b668ed7160b7e40ee1d773800' 
  AND token = 'yp+BIB1KV4Cj3LvxBBRtm4zImoBC79WEejykwVUfUh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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