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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dad2c89aa2a2112df7a49f4a33aae722d9c62b03b5c1e10d1af9a7ba20b43d' 
  AND token = 'l6d8X1rfWZW2JSqHe6AcSAzdaIEiUyvAP46JmA6xuis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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