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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286c8c306d9ee2dd6056e36d566329b926c270deb7145d0b617182b9dff691b0' 
  AND token = 'NpqyQYdh85YfIXtFLYby+JYyVH724WXxMemOOhRzA20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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