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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea14d2543b23a9c912ea3e3abee06ce74d8fdbd78a28ca5e16243b0b2ff7bff7' 
  AND token = 'llFDzUVh3xs3AczwAgWm9A+kYX/6Fwg2+hn+bMNd3dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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