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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9612cf908e101f8123d1dae608526ac69bd17a660febe69fba7d639945e7bc49' 
  AND token = 'N5QCAoU+dvLEjSxnKaRPRJWod1Tlq3061bWJBB5Coyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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