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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b51ee4abc38af55c7c63888d24dae0d42bedf8aeeb142db264d72f21381897' 
  AND token = '32UEc+LBPgGd6A58ku78YR8EUfPdfU8L3RaUqpLD/Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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