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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c12de37a9bea452a5ed0b2f514f614ada4cd00dabe7cf08642b418e5fb16043' 
  AND token = 'hYlJoMxdutaQTQU83QYNIURH17wlDwkEW5gH0NsXU3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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