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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae004ba19fe392f5b8a3cb863673a771ade2c779fa015f4ee3772fe848853cea' 
  AND token = 'bUMxNPD5c5US5lCXzXwAaQhd5tWBD76TuKfe5S4elqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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