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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321da2cefdfbc7a4f23fd0d0d9e47f911050ff1e0e19cb3d3dc1f3202feaa3f3' 
  AND token = 'gjOMFn/PnOjOM/r87h5B+QJIR71cVlfi7CGRq5/DAcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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