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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562e31290568289fad903f3c341aaed3d59e84c032c98ee0c31f2b4fd473cfd3' 
  AND token = 'Pul5KIXspEW7mPYdGcoxLXL+KpcoWOb9x3mOwNsfys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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