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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5379b2a8582d3932bdc24c7ae3e23bb7a68409cafae518b4bbfade299465f655' 
  AND token = 'NK5I7sEPHvnnVl9y5SptxEHmTE1PMoI7um0vy4pKy7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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