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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234b52d261c4582acaa4b2cfa78d76ed64213869548487987f803b2429bd56a8' 
  AND token = '5a5B2zY7NnFnPcmEwW3DzAoVZr9XaLat275f340TjRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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