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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd639e1a4851c4e193e0b38721398e777e893a915a319b89edb1cca1156aa3e3c' 
  AND token = 'UssceB84e/oclzFmdm3nGQSwqBH4zZ1YEs7hMCo4cZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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