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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539f31bf6c0820c4316d24e1601597aec5e5be1815f62297af571c5335b5ad0d' 
  AND token = 'g6Eni99QgvKHyJPfy21qo//HnpM3VW6eYWfaBmd0xX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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