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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa52187b544e71f98f0d26f8bde6ce2f1c8153d0a2d2ca214e6cc3e67a6ba8c' 
  AND token = 'X0x1v3ddfFhYHZOEOuixw0ICnaSdMn1P6HWpIrRHBko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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