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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97ac1f0da3bb438d245cccd8b57a175db684512e4358e5eb4456f4e741b46a4' 
  AND token = 'biOZenEwlKTLiLi9CU0Gl9R9Y/kfyhBTB/JtWfbMX38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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