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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c096af80fd54c95159c4b1e9a05db4314f0ade1aecce2a4cafcc174f15baedc8' 
  AND token = 'CS54tknm5y7YQ11hrQEmWLd05Mli2r7tQ7Veenv0LSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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