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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc014fdc67d10a99ee566d27eab9816a752857a6700164c82ad6537297f7c72' 
  AND token = 'BEJRiR7u/uXVYZsj3gB2luDXbXVTWbtdfcsjmgP5N9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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