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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f4bfa8a8618a0f7a917bf9c243f0d31d59eb1bc223faef76d40b40cf6ea16f' 
  AND token = 'YUi0oMxFaHPY/0+YnGqsgK/XgoUFdCanbCrT8qO3uso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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