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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92359b6e2f8cae59118d8110bf17b8c24c065281da1bde431af0ee4bf3dec25' 
  AND token = 'gXOfBocp2YS1O+0/E1Dqll0nQYG0N/mUpgMKjdqT8ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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