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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb508119670fb0f7341d3923441da767e3306dd124155fe1b8b14df947d55589' 
  AND token = 'Z2P/ag1sZN8oUY6oEuC3B/C7sPWT/bjVyQrZ1yJptUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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