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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac618bf1e588a769e427095ee52eb8f45ed7d6a71ab34900a28dc66c91379a4' 
  AND token = 'KampT6dd6adWsWV+w0sQDDNuGR95NNgceEd84OKw4y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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