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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab5ff75ebeb8be58114e02319760cc0f5d508d31460862a3027a7040bbaa9d2' 
  AND token = 'ymLm6kLvYnI23E7qojrNGeqLFX0ROavoUdRxbAq2+QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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