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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab474b114de02fac5d8404ee06632e5b6f7db88152d626dab4cd32dc8f2b7db' 
  AND token = 'j0R8f1dt3qTnS19RZ7uKAgeUvHJOBQZ2W4w7o/iVre4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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