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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea7f288df20d4a1bf005303e481425c2c032f97eccde6652498dd176bdba606' 
  AND token = '4WPXR0D5X+5l2G3ccALkv31+QnLq/gcjnFnR5hYVLI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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